The Drive Medical Economy Blood Pressure Monitor is designed for accurate, efficient blood pressure measurement. The extra large LCD display is easy to read and the aut0-off function preserves battery life. The memory can store up to 120 readings with an average of the last 3 results. A complimentary travel case is included for versatile daily use. Features Automatic evaluation of each BP measurement per WHO Standards Irregular Heart Beat Detection One Touch Operation Large Easy-to-Read Screen Date & Time Display Pulse Rate Indicator Digital Error Messages Travel Bag Auto-Off Function Memory Stores 120 Readings Average Last 3 Results Specifications Monitor Dimensions: 5.5″ x 3.9″ x 2″ LCD Display Dimensions: 2.2″ x 3.3″ Measurement Method: Oscillometric Measurement Range: 0-300 mm Hg Memory Capacity: 2 x 60 Readings with Date and Time Power Supply: AC Adapter or (4) AAA batteries – not included